Synopsis:Inspired by a classic Joseon legend from Korea's first collection of unofficial historical tales, about a fisherman who captures and releases a mermaid, this drama tells the love story between the son of a Joseon noble family named Dam-ryeong (Lee Min-ho) and a mermaid named Se Hwa (Jun Ji-hyun).

Shim Chung finds herself transported to modern times. She is caught by Heo Joon-jae, a charming but cold con artist who is the doppelganger of Dam-ryeong. But in the present time, Joon-jae works with Jo Nam-doo (Lee Hee-joon), a skilled conman who guides Joon-jae to become a genius scammer. Coincidentally, Joon-Jae’s junior, Cha Shi-ah (Shin Hye-sun), who works as a researcher at KAIST, may be Shim Chung’s only hope for surviving in her strange new world. (source)

Synopsis: In ancient times, Kim Shin (Gong Yoo) is an unbeatable general in wars, but the young King (Kim Min-Jae) is jealous of Kim Shin and kills him. Kim Shin becomes Dokkaebi (Goblin), possessing an immortal life. At first he thinks that he is blessed, but he realizes that he is cursed.

Closer to the present day, Kim Shin has waited 900 years for a human bride to end his immortal life. One night, he saves a dying pregnant woman (Park Hee-Von) who is destined to die. Meanwhile, the Grim Reaper (Lee Dong-Wook) is unable to find the dead pregnant woman. The woman gives birth to a baby girl named Ji Eun-Tak (later played by Kim Go-Eun). 9 years later, Ji Eun-Tak lives with her mother and is able to see ghosts. One night, her mother suddenly dies. On that night, she meets the Grim Reaper.

In the present day, Ji Eun-Tak is a high school student. She still sees ghosts and hears their whisper of “Dokkaebi’s bride.” She now lives with her aunt’s family, but she is mistreated by them. On her birthday, Ji Eun-Tak sits by the sea with a lighted birthday cake. At that time, Kim Shin suddenly appears in front of her. Kim Shin does not know why, but he can hear her voice and appears in front of her against his will. Coincidentally, Kim Shin lives with the Grim Reaper at the same house.

Now, Kim Shin appears in front of her against his will, whenever she turns off the lights. One day, Ji Eun-Tak tells him that he is Dokkaebi and she is his bride.(source)

Pretty much the only dramas I am currently watching. Past ones like "Descendants of the Sun" or "Scarlet Heart?" didn't catch my eyes. Lol. Bottom line, it all depends on the story line too. Hahaha.